The European Wels catfish
You won’t believe the size of this catfish. The biggest Wels Catfish ever caught was 16 feet long and around 660 pounds. So it might as well be called Big Fish cause it looks like the colossal catfish appearing in the movie with the homonymous name.
It might not be a sea monster, but it’s definitely an amazing fish. They’re not really a threat to humans but won’t hesitate to attack them if they come near their nests to disturb them. The Wels Catfish lives in Europe and mostly lurks in tranquil rivers.